Longitudinal Associations Between Physical Activity Behavior and Structural Brain MRI Features After Stroke: A Sub-Study From the Nor-COAST Project.
Geske Luzum, Eva B Aamodt, Heather Allore and 8 others
PMID 41510743WHAT IT FOUND
Stroke survivors who walked more had brains that looked younger on MRI scans.
Each extra 1,000 daily steps was linked to a brain appearing 1.15 years younger. This association held for both light and moderate activity, suggesting staying active may help preserve brain structure after stroke.
Key findings
01Each 1,000-step increase in average daily step count was associated with a 1.15-year lower brain age gap (younger-appearing brain).
02Higher step counts were associated with larger cortex and hippocampus volumes, with each 1,000 steps linked to 0.61% larger cortex volume and 0.98% larger hippocampal volume.
03The least active group ('infrequent and low') had a significantly higher brain age gap (7.44 years older-appearing) and smaller thalamus volumes compared to the most active reference group.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
This is an observational study, so it cannot prove that walking caused the brain changes. It is possible that people with healthier brains were simply able to walk more. The study excluded frailer patients who could not attend MRI appointments, so the results may not apply to more severely disabled stroke survivors. The accelerometer used (activPAL) may underestimate step counts in stroke survivors who walk slowly. The study did not account for which side of the brain was damaged (lesion side), which could have diluted the results. Brain volume changes take years; the study only looked at 18- and 36-month follow-ups, so long-term effects are unknown.
Declared interests
The authors declared no potential conflicts of interest. The project was funded by NTNU (RSO position) and partly by the U.S. National Institute on Aging at the National Institutes of Health.
The easy way to misread this
Do not interpret these results as proof that exercise prevents brain atrophy. This was an observational study, meaning it shows a link but not a cause-and-effect relationship. Patients with healthier brains may have been more able to walk, rather than walking keeping their brains healthy.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →